Coil



Feb. 7, 1928. 1,658,138

` H. c. NIGHTINGALE ET AL conJ Filed Dec. 17, 1924 Patented Feb. -7, 1928.

UNiTED STATES PATENT GFFICE.

HA/R-Y C. NIGHTNGALE AND HAROLD C. NIGHATINGALE, OF PATERSON, NEVI JERSEY.

COIL.

Application filed December 17, 1924.

In certain electrical appliances, as t'or timing coils in radio installations, it is kthe object to `provide a helical coil ivhose use will involve as little as possible loss of energy due to' presence of a dielectric in its construction and the convolutions of ivhose coil proper or helix shall at the same time be iirmly as possible lined each in a delinite position, that is to say, laterally, trans versely ot' the axis of the coil (Whether bodily or radially), and circumierentially since it is knoivn that the slightest displacement ot any convolution out ot' its predetermined position relatively to the others seriously att'ects the eticiency of the coil. The coil herematter described and shown in the accom` panying drawing very perfectly accomplishes this purpose and aiilords'a construction which is also simple and inexpensive to manufacture and possesses certain other advantages which ivill be hereinafter pointed 'out or apparent to those skilled in the art.

In the drawing,

Fig. l is an end elevation oit one `form ot the coil;

Fig. 2 is a plan, with a part ot the coil proper broken aivay on line Qq, Fig. l;

nig. 3 is an end elevation ot anotherform;

Fig. el. is a section on line Fig. 3;

Fig. 5 a section on line of 3;

Fig shows still another form in which :i pltirality ot coils are supported one Within another: and

Fig. is a section oi"- a fragment et ther torm'shoivn in Fig. G on` line T-Tin that ligure.

In Figs. l to 5 let a designate the coil proper or helix, ivhich is here shown formed of ivire.

ln Figs. l and 2 clamping members o and c are arranged one inside and the other outside ot the coil proper or helix and, extending longitudianlly thereot so as to Atraverse its convolutions, coact to hold its convolutions especially in view ot the following: @ne of the members, which are of Vdielectric material (say fibre), as o, has a series ot transverse grooves b in Which the respective convolutions seat, and the other member c bears ivith pressure on the convolutions and coacts with the member Z) to exert a 'frictional hold on them; the Wire is a trifle. thicker than the recess formed by each groove is Wide, so that it requires some torce Serial No. 756,476.

to enter it and the resulting friction becomes a` useful factor in theY gripping coaction ot the members. The convolutions are formed and assembled With the member o by placing the latter on a V:suitable cylindrical mandrel and then Winding the ivire to torni the coil proper around the mandrel and member Z9, and so that the Wire is forced into va groove on each turn. The tivo members ma;7 be neld in the clamping relation to the convolutions by sci'eufbolts E which with their'nuts e act to bind the members together and are preferably arranged at portions ot the members which are shown protrudingfrom the ends of the coil proper or helix. The tivo members o o notv only clamp the coil proper but aiiord a mount therefor as shown in Fig. l, Where is a panel to Which the mount is secured by the screws and their nuts; g designates binding nuts for clamping the conducting Wires A. to the screivs `which thus affords binding posts both for ivires A and the ends of the coil see Fig. The mere pressure, taken With the grooving ot one et the members, is broadly Within the scope of this invention; but We preiier to embody in the actual structure the detail nov to be described, since it not only facilitates assembling the parts with the convolutions in the precise arrangement predetermined but positively insures against their individual creeping or other displacement relatively to the clamping members in the direction ot the lengthA ot' the wire: rThe convolutions have in alinement with each other longitudinally ot' the coil portions o (dotted lines, Fig. 2, and sce also i) each arranged obliquely to the corresiionding convolution: the grooves in member 7), which receive these portions,

are arranged Correspondingly7 obliquely. In consequence ot' this construction, which broadly contemplates oti'setting the portions of the convolutions which flank the member c relatively to the portions directly traversed by it` the coil proper or helix cannot move bodily in the direction ot' the length ot the convolutions, or circuint'erentially thereof; in fact, each convolution is held against such movement and in each direction. This not only determintes the relative positions ot' the convolutions to a nicety but very materially increases the stability of the coil as a Whole.

Figs. 3. 4 and 5 shoiv a construction tolloiving that oi Figs. l and 2 except that 2 Y nasales there are a plurality of sets of the clamping members, the supplemental set h z' beingre# moved circumferentially of the coil proper from the members b c; their screw bolts and nuts are indicated at It the coil VVproper is thus held, as by the members la, i, at a point removed from other clamping members, as Z2 c, the convolutions become proof against displacement in every way. So far as we known it is new to provide a coil structure including a.V substan- Vtially helical lcoil proper and a plurality'of means to clamp convolutions of such coil proper which are removed fromv each other circumerent-ially ofthe coil proper and un-V connected with each other, whereby each convolution vaffected is not only definitely spaced at one point from its neighbors, and also held aga-inst shifting circumierentially, butis held at a remotepoint from distortion, bending or warping (as under temper- Y ature influence) laterally, the prevention of even almost microscopic displacement of the convolutions of a coil proper for tuning purposes in a radio apparatus being very necessary to theproper operation of the coil.

In Figs. 6 and 7 is `shown a. construction in which VoneV or more 'laminated sets 7c of clamping members (two or more such inembers to a set) clamp a pluralityoi1 coils proper or helices alternatingv therewithtwo` such sets, Yremote from each other, being shown. In this case one of the end clamping members, as 7c', may be plain or ungrooved and the others grooved Vat their corresponding faces, so that the back or ungrooved side of one member will coact with the Vgrooved side of an adjoining member to'V clamp or gripftheconvolutions, In any so-called low-loss timing coil of bare wire (illustratedin all the views of the accompanying drawing) heretofore devised the construction was not adapted so far as we are aware for the placement of coils propei' in a concentric or nested arrangement. By resort to laminated clamping members alternated with the coils proper (ol:l dilerent Adiameters and arranged one within another) weare able to produce acoil having its convolutions in this arrangement.

In the construction of Figs. 6 and 7 we actually show two coils proper, primary Z and secondary m, the latter comprising here three concentric convolution-groups ai'- ranged around the primary (Z) and formed of a single wire las indicated by the connecting portions thereof at m; the primary is here shown as having the lower two binding posts for its terminals and the secondary as having the upper two for its terminals, as indicated at` Z2 m2, Fig. 7

ln any typ-e of so-called low-loss'coil of which we are aware tlie points and areas ot contact of the dielectric medium` for maintaining the coil proper in shape, as well as the mass or bull; of such medium, `are not.

active therewith to prevent circumferentialV movement of the convolution in each direction. y

2. A coil structure including a Vsubstantially helical coil proper and means to hold convolutions of the coil `proper spaced from each other, each such convolution having an otseton each side of said means and coac-V tive therewith to prevent circumferential movement of the convolution.

3. A coil structure including a substantially helical coil proper and means to hold convoliitions of the coil proper spaced from each other, said means having a plurality of recesses receiving the respective convolutions and'v each such convolution having the portion thereof received bythe correspond- Y ing recess arranged obliquely with respect to the remander of the convolution.

el. i coil structure including a substantially helical coil proper and means to hold convolutions oit-the coil proper spaced from each other, each such convolution having an oiset portion tlanhing said means and holding the convolution against circumferential displacement in each direction.

In testimony-whereorn we affix our signatures. i'

HARRY C. NIGHTINGALE. HAROLD C. NIGHTINGALE 

